Michael J. Andrews is assistant professor of economics at the University of Maryland, Baltimore County. Aaron K. Chatterji is the Mark Burgess and Lisa Benson-Burgess Distinguished Professor at Duke University’s Fuqua School of Business, professor at the Sanford School of Public Policy, and a research associate of the National Bureau of Economic Research. Josh Lerner is chair of the Entrepreneurial Management Unit and the Jacob H. Schiff Professor of Investment Banking at Harvard Business School. He is a research associate and codirector of the Productivity, Innovation, and Entrepreneurship Program at the National Bureau of Economic Research. Scott Stern is the David Sarnoff Professor of Management and chair of the Technological Innovation, Entrepreneurship, and Strategic Management Group at MIT Sloan School of Management. He is a research associate and director of the Innovation Policy Working Group at the National Bureau of Economic Research.